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System and method for providing alternate AC voltage
| Details |
Inventors: Green, John D.; Sheka, Gregory J.; Thompson, Michael L.; Hissong, John B.; Tan, Ming D.;
Assignee: Holophane Lighting, Inc. (Newark, OH)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Kaplan; Jonathan S.
Attorney, Agent or Firm: Brooks & Kushman P.C.
A system and method for providing an alternate AC voltage to an electrical load having a main AC voltage. The system and method include a signal generator for generating a main AC voltage signal representing the value of the main AC voltage, and a processor for processing the main AC voltage signal to determine a status of the main AC voltage, a main AC voltage failure time period, and a main AC voltage restoration time period. The system and method also include a control signal generator for generating a control signal in response to the main AC voltage signal, the main AC voltage failure time period, the main AC voltage restoration time period, and a pre-selected delay time period, and a switch for switching the electrical load between the main AC voltage and the alternate AC voltage in response to the control signal. |
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DETAILED DESCRIPTION We claim: 1.
A system for use with primary and secondary electrical loads having a main AC voltage source, the system providing an alternate AC voltage source to the primary electrical load in the event of a failure of the main AC voltage source, the system comprising: means for selecting a delay time period based on the secondary electrical load; means for generating a main AC voltage signal representing the voltage of the main AC voltage source; means for processing the main AC voltage signal to determine a status of the main AC voltage, a main AC voltage failure time period, and a main AC voltage restoration time period; means for generating a control signal in response to the main AC voltage status, the main AC voltage failure time period, the main AC voltage restoration time period, and the delay time period selected; and means for switching the primary electrical load between the main AC voltage source and the alternate AC voltage source in response to the control signal such that the alternate AC voltage source is conserved.
2.
The system of claim 1 further comprising: a DC power source for supplying a DC voltage; means for charging the DC power source; means for inverting the DC voltage to the alternate AC voltage; means for inputting the pre-selected delay time period; and means for outputting a transfer indication signal in response to the control signal.
3.
The system of claim 2 wherein the means for charging the DC power source comprises: a plurality of chargers, each charger supplying a current to the DC power source; means for generating a plurality of charger current signals, each charger current signal representing the magnitude of the current supplied to the DC power source by one of the plurality of chargers; means for processing the charger current signals to determine a relative relationship therebetween; and means for generating a plurality of charger control signals, each charger control signal for receipt by one of the plurality of chargers, the plurality of charger control signals operative to equalize the currents supplied by the plurality of chargers
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Communications 
